Method of forming type-bar guides



Aug. 25, 1931. F. u. comm: 1,820,440

METHOD OF FORMING TYPE BAR GUIDES Filed April 4, 1 929 Mwnfor:

Affom v Y Patented Aug. 25, 1931 FREDERICK U. 001mm), 0F "BBIDGEPORT,ooNNEo'rI'ou'r, ASSIGNORTOQUNDEBWOOD' ELLIOTT FI HER COMPANY, OF NEWYORK, 1v.Y., A-coRPonATI01 IoF 'DELAWARE;

f METHOD or FORMiNoLTYPE-BAR GUIDES .App1icationjfiled April 4, 1929.Serial; 352,413. I I

This invention relatesjtotype-guides for typewriting machines and themethod ofmaking the same, and

manufactured and efficient in its operation. I In type guides fortypewriting machines it is ne'cessaryto form flared guide-openings forthe type-bars to enter before the types Il reach the platen,sothat-in'th'ejevent the'bars I I II I I I I afterthe sj e'cond'swed'gin Iare slightly sprung out'of the exact align} them to assume the ment, theguide will cause correctposition. In order to providethis necessary touse ing and then machine down the stockwhe're it wasnot needed, allatvconsid'erableexpense in material and labor. a I

Onexofthe features of this invention relates to the method of makingatype-guide with the'least, amount of material.

Another feature of this inventlon relatesto the advantages of doing awaywith expensive Operations. I Another feature liesinthe processusedinsteel or'other alloy, it. is practicable'to hold the thickness 1 closervor more accurately thanthe usual irregular forms heretofore used,

thereby making the 'guidemuch easier to manufacture and finishf 1 1Other features and advantages will hereina'fter appear. I I I Referringtothe drawings;

Figure 1 is a-view of the guide assembled more specifically to a vmethod of maklng a novel form of guide that 16 has been speciallydesigned to be easily afterthejfirstswedging operation.

Figure'5is an edge' fview ofFigure Le 7 Figure 8'1s araee view of flaredguide-opening heretofore it; has been material'havinga thickness equal,to the totallength of the guide-open- I milling operations andreplacingthem with very much cheaper punch-press. and swedging Iformingthe guides. By cold swedging the means of a screw 51 -Dowel pins35, 35 may with the partsofth'e machine is associatedf, F1gure'2 1s ametalin the firstioperationfi face view of the'blan'k or" work-piece asit is punched out of sh'eet- Figure '4! is a faceview of the work-pieceFigure 6"is'fa faceview of the work-piece g operation. I

Figure? isanedge View of Figure 6. t I

after the'third swedging operation. I I II Flgure 9 is an edge vlew-ofFlgure 8;. r

the work-piece V 4 Figure 1015a r'ear'view of thefwork-piece I aftercertain piercing operations. 7 Figu after all of the piercingoperations. I

Figure 12'is afac'e view of the work-piece after it hasbeen trimmed'tofinished contour.

V Figure 13isan, edge View of Figure 12'. II

re ll is aface view of thefwor'lz piece Figurell is an isometric Viewofthe completed guide ready tobe assembled. f

The guide. 21as shown in Figure '14 is sub stantially 'a'fiatplate,generally rectangular in form and constru'cted'with'a pair of jaws 22and 23 at one end havingaflared opening 31 between them, to guidethetype-bars 32 I I 1 iso ' to the platen. The opening 81;is .a slot whichruns into an'apertu're' or cutter-clearing hole into proper typingpositionfwith; reference 27 located just beyond the jaws 22 andr23.

The. guide is providedwith projecting corj ners or horns 25'and 26,having fillets 24:,- at its upper end, and these are chamfered as shownat 34:, Figurele, to form paperdeflecting faces neanthe surface of -theplaten. Near the center of theguide 21 'is'pierced an opening 28; t0form'a pointer 29, for a' sca le on the carriage"(not shown). jNea r-thelower end of the guide is apierced and tappe'd hole 30 which enables theguide to be assembled to I the segment 36], in a recess 38 and 43securing it to a cross-ba'r37, forming 39 and 40 and 'do-wel pins 42'100 er n; by

part of the frame of the machine. The segment 36 is provided with theusual radial slots 41 to receive the type-bars 32; The upper end of onetype bar 32 is shown in dotted lines in Figure 1, in typing position, atwhich time the bar 32shas fully entered .the guideopeningBland thetypehasbeen properly located laterally thereby in position on the platen 44.

'The novel method of manufacturing the type bar guide described abovewill .now be considered.

In the series of views from Figure '2 to Figure 13 are shown onesequence of operations needed to produce the finished guide.

In putting this invention :into practice 1 the first thing necessary isto determinethe shape of theblankand to do this it is necessary todetermine the amount of material needed at different places :alongthelength'of the blank by dividing -.it .into imaginary parallel zonesequally spaced andrunning trans-versely of the blank. .Two ofthesezonescorre spondinglylnumbered are indicated .in Figures .2 and'12. By referring to :the zone between lines45 and 46 it is seenthatsthemaximum amount of 'material is v needed at this placeon accountof the increased thickness necessary to produce I a .lug .in relief forthe jaws 22and223, Figure 14. The thickness of the blank may beapproximately-the-saine as the greatest .-thickness ofjthe finishedarticle atany-plaee. Having determined the amount of material'needed-in-eacl1 zone theshape of the blank 49 to produce it .is readil-y:arrived at. Y

Oneof'the novelifeaturesofthis invention liesin swedging-theimaterial sothatit'fiows only in predetermined directions, .thereby .making itpossible to .figure out '10 a .nicety the amount of .material :needed.and "thereby reducesthe waste=to aminimum. J-Inthe presentflinstancethematerial is designed to (flow almost entirelyllaterallyiand .to bedeliber- .ately restricted from flowing longitudinally excepting insofaras it isnecessary'tofill out the contourpf the piece. lnasmuchns theguide21 is oftlie same .crossrsectionthroughnut mostofits length theblank '49 will likewise be the same, the difference being that :inasmuchas ithe blank -must be of the same thickness as the greatest thicknessof any ,portion ofthe guide,-the widthof-theblank will :becorrespondingly less.

.-Ha.ving determined the shape of-theblank,

' 'therfirstoperation is to punch-out the same,

.asshown in Figures. 2 and 3, in an ordinary ip'ower punch-press.

'The second operation is to die-swedge the blank'49"to the forms inFigures stand 5 vehere a tapering projection or lug -5.0 .is formed bycompressing the blank around-the .lug-position-to"leave .the luginrelieii andtlie xblan-kvredueed in thickness, thelmetal of the actionsQ7=5and48 spreading sidewise and the leave hard, compressed, parallelsections and 46 spreading sidewise and lengthwise away from the lug toform a beveled face 34:. Through the suitable for mation of the swedgingdies for the subse quent operations the over-all length of the Figure 4:blank will not be appreciably affected, the-metal preferably spreadingside wise as the thickness of the blank is reduced. The last swedgingoperation may be made by a combined finishing and flattening die atosurfaces 'requiring no subsequent surface-finishing beforebeingassembled upon the type-bar segments.

FiguresG and 7 show a second swedging operationand Figures 8 and 9 showa-third and final swedging-operation needed to get the stock down to thedesired. thickness and width. Between the swedging operations the piecemay be annealed iii-required, depending-upon the kind of material used.

The holes 28 and 30 may be simultaneously pierced .in'the swedged blank,as shown in Figure 10, and these two holesbecome locatingholesforlocating the blank for the subsequentpiercing and machiningoperations. The hole 27 and the twoJdowel holes 3535 may bepierced atthe same time-at a second piercing operation, if desired, taking alocation from the pierced holes 28 and 30. The swedged blank may now beidie trimmed to the form of Figure 12 by removing the superfluous stockand forming the two beveledof? horns 25 and 26. The two holes'28 and 30may again locate and centerthe'trimmedand pierced blank in a fixture formilling "a slot throughthe lug 50 and intothe'tool-clearauce hole27, toformthe type-bar guiding and typebar centering opening 31. Inthis'manner the finished guide has become an interchangeable productthat can be correctly and quickly located upon any segment 36 by thedowels 85 and secured by the'screw 51.

It will, of course, "be understood that the guide'21can betempered orcase hardened, if desiredyto give greater wearing quality to theguide-opening 31 that the type barguide is theproduct'of'compression'andthe attendant expansion of metal'by a coldproc ess between powerfulswedging dies, ;as distingished from the hot process'under drop hainmerimpacts; thatthe cold swe'dging is a labor-saving process because of theabsence of hard surface scale'thatrequires sea-larcmoving operations;that the cold swedging process gives bright, smooth, hard-finishedsurfaces that require no subsequent surface finishing; that the lug "50,the paper-deflect- Ting faces34: on thespacecbapart horns 25 and 26 andthe -pointer 29 are all progressive power-press operations; and that.thesingle .milling'operation for the type-bar slot 31 is the onlymachine-cutting operation :required in the production of the guide.

This IIIVGIItIOII, while disclosed inconnecin O tion with making guidesfor type-barsof .typewriting machines, may be generally useful in makingmany articles of a similar nature and the claims based upon the methodof manufacture are, therefore not restricted to any particular articleor definite part of a machine.

Variations may be resortedto within the scope of the invention, andportions of the claim: a

improvements may beused without others.

Having thus described my invention, I

' 7 tvpe-bars.

2. The method of developing a guide for the type-bars of atypewritingmachine, in-

cluding punching out as metal blank of uni-' form thickness and ofvarying widths along its length predetermined by the economicaldistribution of metal for a finished product,

cold swedging the punched-out blank tore- -d uce its thickness, increaseits area, form a 1 lug in relief on the swedged blank, and then die-trimthe edges of the swedged blank for a finishedtype-bar guide blank.

3. The method of developing a' guide for thetype-bars of a typewritingmachine, inr I eluding punching out a metal blank of uniform thicknessand of varying Widths along its length predetermined by the'economicaldistribution of metal for a finished product,

cold swedging the punched-out blank to reduce its thickness,increase-its area, form a' lug in relief .on .thelblank, bevelthe freeend ofthe blank above the lug, and then dietrim the edges of the swedgedblank to a final form to provide spaced-apart beveled-01f prongs ateither side of'the lug forv paperdeflecting elements;

4.. The method of developing alguide for the type-bars of 'a typewritingmachine, including punching out a metal blank of uniform thicknessandof' varying widths along its length predetermined by the economicaldistribution of metal for a finished product, co1d-swedging thepunched-out blank to reduce its thickness, increase its area, form a lugin relief on the swedged blank dies-trim,

the edges of the swedged blank for a finished its length predeterminedby the economical distribution of metalfor a finished product,

cold-swedging the punched-out blanktoreduce its thickness, increase itsarea, form a lug in relief on the swedged blank, die-trim the edges ofthe swedged blankfor affinished blank with locatingholes, said locatingholes aligning [the blank for a mill-slotting 'cuti through'thelug toform jaws that guideand center the type-bars. 6.'Thefmeth0d ofdeveloping a guide for.

thetype-bars of a typewriting machine, ineluding punching out a blankfrom sheet' metal for a uniform thickness and varying widths along itslength according to the eco-' v type-bar guide-blank, and pierce thetrimmed i nomical distributionof metal for anirregular" I product,reducing the thickness of the "blank I to a'thin' flat plate of definitepattern with i a lug inrelief thereon, by a series of separate coldswedging operations, and then die-trimming the edges ofthe platerelative to the location of the lug.

7. The method of developing a guide for? the type-bars. of a typewritingmachine, 1n-

eluding punching out a blank from sheet-1 metal for a uniform thicknessand varying widths along its length according to the eco-f,

lar'product, reducing the thickness ofthe with a lug in relief thereon,by. a series of separate cold swedging operations, die-trim ming theedges of the plate relative to the 10-- cation of the lug, andthenpiercing theiplate under the lug toforma scale-pomter, I k FREDERICK U.CONARD.

nomical distribution of metal-for an irregu-1 9 blank to a thinflatplate of definitepattern I type-bar guide-blank, and then pierce thetrimmed blank with locating holes for subsequent machine-tool operationsfor an interchangeable product.

5. The method of developing a guide for I the type-bars of atypewrit'ing machine, in-

eluding punching out a metal blank of'uniform thickness and of varyingwidths along

